Move thread_pool.h into utils so it can be shared by more than one example.

native_client_sdk/src/libraries/nacl_io/pepper_interface.h

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef LIBRARIES_NACL_IO_PEPPER_INTERFACE_H_
 #define LIBRARIES_NACL_IO_PEPPER_INTERFACE_H_
 
 #include <ppapi/c/pp_completion_callback.h>
 #include <ppapi/c/pp_file_info.h>
 #include <ppapi/c/pp_instance.h>
 #include <ppapi/c/pp_resource.h>
 #include <ppapi/c/pp_var.h>
 #include <ppapi/c/ppb_console.h>
 #include <ppapi/c/ppb_file_io.h>
 #include <ppapi/c/ppb_file_ref.h>
 #include <ppapi/c/ppb_file_system.h>
 #include <ppapi/c/ppb_messaging.h>
 #include <ppapi/c/ppb_messaging.h>
 #include <ppapi/c/ppb_url_loader.h>
 #include <ppapi/c/ppb_url_request_info.h>
 #include <ppapi/c/ppb_url_response_info.h>
 #include <ppapi/c/ppb_var.h>
 
-#include <utils/macros.h>
+#include <sdk_util/macros.h>
 
 // Note: To add a new interface:
 //
 // 1. Using one of the other interfaces as a template, add your interface to
 //    all_interfaces.h.
 // 2. Add the necessary pepper header to the top of this file.
 // 3. Compile and cross your fingers!
 
 
 // Forward declare interface classes.
@@ skipping 57 matching lines @@
   PP_Resource Release();
 
  private:
   PepperInterface* ppapi_;
   PP_Resource resource_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedResource);
 };
 
 #endif  // LIBRARIES_NACL_IO_PEPPER_INTERFACE_H_